Biology (NTSE/Olympiad)  

8. Our Environment


Ecosystem is a self contained ecological system which consists of a distinct biotic community and the physical environment, both interacting and exchanging material between them.
Natural Ecosystem.
They are ecosystems which develop in nature without human support. Natural ecosystems are of two types, terrestrial and aquatic.
Terrestrial Ecosystems :
Occurs over land. They are of three major types desert, grassland and forest. Aquatic ecosystems are found in water bodies, e.g. ponds, lakes, rivers (fresh water), estuaries, marine (salt water)
Artificial Ecosystems.
They are ecosystem which have been created and are maintained by human beings.

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